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Thread: 2011 KK (Liberty) CEL - Need Advice

  1. #11
    Meme King WJCO's Avatar
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    Are you getting those leak down specs from the service manual or from instructions that came with the tester? 30-44% seems high to me.

    As far as your compression numbers, those seem close enough to not worry about IMO.
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  2. #12
    Old Timer sipafz's Avatar
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    I donít know what the actual specs are yet. Iím just going by the gage. Like I mentioned, I was having issues with the gage due to how cold my garage is. Iím going redo the test on a warmer day which may led to the gauge reading differently.

    Iím encouraged by that I couldnít hear or see any glaring problem. I started it up this morning and the CEL remained off.

  3. #13
    Old Timer sipafz's Avatar
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    Update: After a week of the harshest weather this season, I was cautiously optimistic that the plug wires were the issue. No CEL during the stretch of -30 temps. Unfortunately as the temps got closer to freezing the CEL came back on, P0302. I took a look and as I was moving around the new plug wires I noticed a manifold bolt/stud with a wire route clip rotate. Not just the clip, but the whole stud rotated. I tightened it back to 105 in/lbs and checked all the other bolts. I found that the bolt next in line was also loose and as luck would have it these loose bolts were by cylinder 2 & 4. I have no idea how those bolts would come loose as I have never touched them in the past. Anyway, those are tight and will see if that makes a difference. Maybe a vacuum leaking was happening during cold start and improved as the engine warmed?

    I got my bottle of BG44K and added it to the fuel system. I plan repeating the leak down test in a few weeks and hope this stuff helps the minor leak on the #6 intake valve.

    New complaint from the wife is that the heat is blowing cool on the drivers side and hot on the passenger side. Iím going to flush the heater core today. 3 more years and Iíll be happy to let this Jeep go in trade for a new JLU or JT

  4. #14
    Old Timer sipafz's Avatar
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    Update: November 2019

    As per usual, this Jeep Liberty ran good with no issues the entire spring, summer and fall of 2019. Once the weather got colder the CEL retuned. The diagnostic tool showed the normal P0302, misfire cylinder #2 with a low double digit weighted average (40 or so). Nothing to keep from using the vehicle on a daily basis. Fortunately, the cold snap was short and I was able to spend some time with the Jeep the following weekend.

    I started with repeating the leak down test. The garage temperature was in the 50ís and I found that the tester and gage were repeating which gave me confidence in the test. Results were an average pressure loss of 15% with the suspect cylinders of #2 & #6 being on the lower end of the average.

    Since I didnít find anything definitive, I started the vehicle connected the scan tool and started to track misfires. What I noticed is that if I put the vehicle in gear with the brakes on and let the engine idle (roughly 600 rpm) the engine will misfire once every ten seconds maybe. This happens whether the engine is cold or hot and is most prevalent when in gear, brakes on and at idle.

    To confirm this result I took the vehicle out for a drive with the scan tool continuously collecting data. No additional misfires are reported during normal driving. The misfires do return if I pull of the road and idle as described above.

    Iíve come to the conclusion that the cold weather exasperates the situation by letting the vehicle idle to warm up. The fact that the engine seams to misfire more at lower idle rpm is interesting and that having the vehicle in gear with the brakes on has me thinking I might has a vacuum leak somewhere? My next step is to look for a leak. In the meantime I ordered a gage to help aid in the search:

    IMG_0296.jpg

    As always, please let me know if you have any ideas on additional things that I should consider.

    Chris

  5. #15
    Addict BaddestCross's Avatar
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    Vacuum leak would seem to be a likely culprit. Especially since you said that it's more common when you're pressing on the brakes.



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